Manufacture or lining of pipes by centrifugal action



Jan. 20, 1931. c. c. HALKYARD MANUFACTURE 0R LINING OF PIP-ES BY CENTRIFUGAL ACTION Filed Sept. l0. 1929 Patented Jan. 2o, 1931 UNITED STATES lifrilfuNr` OFFICE CHARLES CYRIL HALKYARD, or MELBOURNE, vieron-1A, AUSTRALIA i MANUACTURE OB LINING OF PIPES BY CEN'IRIIEUGAL AC'IEION' .i

Application inea september 1o, 1929, serial No. 391,683, ana in Australia may 1o, 192e. j

This invention relates to the lining or moulding of pipes and like hollow bodies by centrifugal action and refers more particularly `to "the lining of metal pipes with 5 cementitious, bituminous or such like material and to the manufacture of concrete or cementitious pipes, poles, columns and the like by the centrifugal process. 4

Copending United States patent specilication Serial No. 820,697 discloses fa method i and `means `whereby a series of pipes `or moulds Ymay bef ,simultaneously supported and 4rotated by resting-'the pipes or moulds upon the upper stretchesl of endless supporting and driving bands so that themoulds or pipes, by their Weight, form open topped bights or sags in said bands between the pulleys over which the bands pass. The endless bands are thus placed in tension and are capable of simultaneously rotating the pipes ormoulds whilst they are supported Vwithinthe open topped bights-of the-bands. `Provision isjalso made for Vadjusting the sags of said bands made necessary by the stretching `ordifferencein length of the bands. This is eected bymeans of adjustable bearings carrying certain ofthe pulleys Vover which the bands pass.

An objection `to the `foregoing' arrangement is the diiiiculty of maintaining a uni- V.form or equalized sag upon the endless bands and of keeping.: the various 'moulds or pipes in proper horizontal position on the bands owing to the uneven stretch which is liable to occur in the relatively long rbands employed and to variations in the weight and other conditions ofthe pipes or moulds. Furthermore itis not possible inthe fore- `going installation, without adjustments toV the length of the bands, to operateV onf'only one mould or pipe at a time-in cases where this may be desirable.

The objectof the present invention is to provide an improved-arrangement ofthe abovementioned type which will; overcome the disadvantages referred to land venable two or more pipes ormoulds-tobe simultaneously supported and rotated `in such a manner as to ensure effective operation and" 5 vobviate thennecessity ofvusing unduly long i Figure 'll'is a bands Vwhich are subjectto excessive stretching and `other disadvantages. j

In accordance with the invention instead of employing only one pair-or seti of laterally spaced endless bands passing over longitudinally aligned pulleysaps disclosed in the aforesaid prior specification, we employ at least two pairs or sets of laterally spaced endless bands passing over pulleys which" are so arranged that, when viewed inplan, the? endless bands of certain pairs or` sets i arey arranged in staggered relationship or out of "longitudinal alignment with thoseof other pairs or sets. By this means two for more pairs or sets of relatively vshort belts or bands may be arranged iin battery formation so that a mould or pipe 'may be rested upon the upper stretches of each pair or ksetof j endlessf supporting and driving v bands whereby the whole series ofpipes or moulds may be simultaneously supported and rotated, or through the medium-of suitable clutch or like mechanism, only asingle pipe or mould maybe operated upon at onetime.

Theterm sets as above used @is intend,` ed to apply where three or more' laterally. spaced bands are employed in lieuof a pairv as, for example, :in the caseof `particularly long pipes or moulds. i v." 1 v i. Means are alsovprovidedlfor individually-` adjusting the degree ofsagin` each endless belt or band so'that the various pairs or sets of bands may properly maintainzthe pipe or Lmould thereon in l lcorrect-horizontal position during rotation. i` j Referrlng to the drawings which form part 'ofthis specilicationz-f,V i j front view -of apparatus ac- Y cording to theinvention.

`I`,Figure ZisaplanpfiFigure l. Y

Three or more shafts 6, 6a, 6b,

ported in parallel side by side formation by suitable bearings`7, the shaftsfcarrying pulleys for thejdrivingfand supporting bandsVV as hereinafter referredf to.

The shaft Gat one end'ofthe series Aorbati y tery may constitutey a driver and be fitted with eciaresup'v a vchange yspeed-,cone pulley 8` andfastand Y vloose pulleys 9.2 This driving shaft 6V may be provided adjacent each end'with asingle i1 Y `porting and rotating bands 12.

pulley 11 for driving two pipe or mould sup- K The shaft 60 at the other end of the battery'may be provided at each of its ends with a single.

pulley 11a, while the intermediate shafts 6a and'b are provided with two pairs or axially spaced pulleys 11 and'lla. Y Shafts 6b and 6c are each shown in two separate short sections but they may each be in one length extending completely across the machine.

The arrangement Yis such/'thatfthepairs of bands 12, 12a, 12b passing around the associated pairsv of pulleys 11, lla'project' longitudinally one beyondnthe other and are staggered outof longitudinal alignment when viewed in lplan. Preferably' the' secondV pair of bands 12a a-revdisaligned longitudinally 'from the `first ,and'thirdpairs 12 -and` 12b whichare in longitudinal alignment as shown in Figure 2.. Itwill be evident thatA a plu rality of pipes 'or moulds'lfmay'be supported within the sags 14:` inthelf upper stretches of.

the respective bandsand simultaneously rotated thereby., VTo operatev a fourth mould or pipe a fourth pair of vbands with pulleys may Vbe arranged 'in' vlongitudinal alignment withy the second pair-of bandsand so on.

Y 4.Ea-ch band' may also;pass around a third or adjustingpulley lca'rriedfby a shaft -17vsup portedfby a bearing 18 which is adjustable along guide members or rails19 extending at right angles to the aXesof the pulleys, wherebythe depths ofthe sags orfdepressions 14 in the various bandsmay begindcpendently adjusted to suit varyingfconditions, such for instance as'toY enable different pa'irsor sets of the endless bands :to support and rotate pipes yor moulds of dierentV sizes 'or weights.

The`leading pulleys 11 on` the shafts 6a and 6b may befixed thereto *or they-YY may be vloosely mounted and adapted to be made; fast -to their shafts bysu-itable clutch devices (not shown) controllable by an operator so that one or more of the bands may beidle while the other band or bands may be operating.

It will be obvious that `instead of thepairs of pulleys 11, 11a on the shafts 6a, 6b wider yfaced pulleysV may Vbe'fitted to receive'the :adj acent portions of the respecti-vebands.

A braking device for vthe apparatus may comprise a druml' iixedto the shaft 6"and a brake band consisting of a strip'QQ'of spring steel of U form having blocks 23 attached to Y its semi-circular portion-and adapted to lbe pressed into Contact with the periphery'of-the :drum -by depression of a `:spring returned i Y pedal'24. Y

Excessive end movement offthe pipes=or moulds 13 may be preventiedvby'flanged-collars 26 removablyl appliedf'to 'the' moulds for pipes Vso as vtoV extend"between-:stop members 27. i l f Furthermore to impart "vibratory motion to they pipe or moulds 13 while theyare being lrotated by the-bands so that the combined J arm'29 hingeably supported by a 'taneously' rotated;

centrifugal and vibratory actions willvcause cementitious or like material to be effectively consolidated within the pipes or moulds one or more contact members 28 may be arranged to engage `or rest upon each pipe or mould or a part rotating therewith. Each contact member may consist of a blockrof wood or other material carried at the outer end of an suitable frame 30.

-Ha`ving n'oW fdescri-bed my invention what I claim as new and desire to secure by Letters Patent is z- 1. Improvements in and relating to the supporting and rotating of moulds'or pipes to be 'centrifu'gally linedwith plastic material;

a sag in the upper stretch-of each' band, whereby the moulds orpipes mayibe simultaneously 'rotated by linear motionof said vbands 'withband or laterally spaced set oflassociated bands affecting'V the tension .or/'the depth fof vsag in another band or 'set ofbands.

Q. vlnapparatus for supporting Vandfrotating moulds or pipes to be centrifugally-wlined 'withf-plastic y material7 at least two pairs V"of :laterally 'spaced endless rbands, andat least three longitudinally f spacedv pairs of pulleysloutthe tension or 'depth of thezsag in any for' said bands, saidfpulleysbeing so arranged thateach pair of bandsipro] ect longitudinal- 'ly-beyondlan adjacent pairlan'd are-staggered `or outl of longitudinal 'alignmenttherewith5 whereby a' plurality of pipes or mouldsmay rest within laterall-yfaligned sags inthe -:upper stretches of said pairs of'bands'andbefsimul- `'-combination with separateidevices forfi'ndependently varying the' depth o-f'frthe sagsiiin the upper stretches ofthei bands.A 4. In'a'pparatus for supportinga'nd rotating moulds orpipes tofbecentrifugally lined 'with'plastic material; 'a-seri'es of at leas'tthree shafts arranged horizontally= in side'fby side formationg-each endzshaft ofthe series-having lor setsof laterally spaced' longitudinallyQleX- tending endless bands-arranged onsaid-*pul- 'leys, thelbands ofi alternate pairs-"or'se'ts pro-V jecting longitudinally beyond -the-fother and -being staggered when viewediinplan.

5. In apparatus lfor supporting and rotatend of each end shaft of theseries, a pair of pulleys mounted adjacent each end of each intermediate shaft of the series, endless bands extending loosely around the pulleys in laterally spaced pairs, and means for connecting one of the pulleys with a source of power so that each pair of bands may rotate a mould or pipe While it is resting upon the upper stretches of the bands.

In testimony whereof I ax my signature.

C.l o. HALKYARD. 

